Decimal point mechanism for calculators



April 30, 1963 I N L. J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 1 Jam-l n'adn Z5 5 a o:

.LBVLS 9 831MB INVENTOR. LLOYD J. LAPOINTE AT TORN EYS April 30, 1963 J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 2 FIG. 2

In. l

H4 INVENTOR.

LLOYD J. LAPOINTE ATTORNEYS Apgil 30, 1963 J. LAPOINTE DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. l9, 195a 42 Sheets-Sheet 3 INVENTOR.

J. LAPOINTE LLOYD April 1963 L. J. LAPOINTEI 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 4 lllll IN VEN TOR. LLOYD J. LAPOINTE BY @m, QWA.M.QM

ATTORNEYS April 1963 J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 5 FIG. 5

- IN VEN TOR.

LLOYD J. LAPOINT E l I ATTORNEYS April 30, 1963 J. LAPOINTE 3,087,573

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets- Sheet e rw 8 no ,7, I r O B N 'J (D I- C) v v n O O O r (P IOIO INVEN TOR. LLOYD J. LAPOINTE ATTORNEYS April 30, 1963 L. J. LAPOINTE'. 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS 42 Sheets-Sheet 7 Original Filed Nov. 19, 1953 U KE INVENTOR. LLOYD J. LAPOINTE ATTORNEYS 1.. J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS v42 Sheets-Sheet 9 April 30, 1963 Original Filed Nov. 19, 1953 FIG. 9

cd in at 9 9 336 33 33 I33 334 336 D INVEN TOR.

FIG.8

FIG.8B add at 0 sub. at 0 ass @133 336 133 BY 354 3 2- ,C3-,@-M Q' QWQ LLOYD J. LAPOINTE ATTORNEYS Aprll 30, 1963 J. LAPOINTE DECIMAL POINT MECHANISM FOR CALCULATORS 42 Sheets-Sheet 10 Original Filed NOV. 19, 1953 M EN EN EN ONN w czwezo 2.3mm kw. 556mm wmamlmm.

z oz 55 mm IT QE IN VENTOR LLOYD J. LAPOINTE ATTORNEYS April 30, 1963 J. LAPOINTE DECIMAL POINT MECHANISM FOR CALCULATORS 42 Sheets-Sheet 11 Original Filed Nov. 19, 1953 INVENTOR. LLOYD J. LAPOINTE BY QM, M,M M,

. ATTORNEYS Apnl 30, 1963, L. J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Fild Nov. 19, 1953 42 Sheets-Sheet 12 FIG. I?)

INVENTOR. LLOYD J. LAPOlNTE ATTORNEYS April 30, 1963 L. J. LAPOINTE DECIMAL POINT MECHANISM FOR CALCULATORS 42 Sheets-Sheet 15 Original Filed NOV. 19, 1955 BY I @w,awu-A,Mv

ATTORNEYS A nl 30, 1963 1.. J. LAPOlNTE 3,037,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 14 unuunuuu UEHHHHDDUHUUHHHDHUHEHE} uunniuai INVENTOR. LLOYD J. LAPOI NTE ATTORNEYS April 30, 1963 J. LAPClNTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet l5 INVENTOR. LLOYD J. LA POlNTE ATTORNEYS April 30, 1963 L. J. LAPOlNTE 3,037,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 16 FIG. 2\ 205 Jr 3%? s42 INVEN TOR. LLOYD J. LAPO|NTE BY QAAJQ,MM'QM ATTORNEYS A ril 30, 1963 1.. J. LAPOINTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 2 heets-Sheet 1' L LOYD J. LAPOINTE ATTORNEYS L. J. LAPOlNTE DECIMAL POINT MECHANISM FOR CALCULATORS April 30, 1963 42 Sheets-Sheet 18 Original Filed Nov. 19, 1953 F|G.24 F|G.25 H626 FIG.27

QZMQZO FIG. 40A

@Q INVENTOR.

LLOYD J. LAPOINTE us @m, M, M. M

ATTORNEYS April 30, 1963 J. LAPOlNTE 3,087,673

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 19 H6. 29 F|G.3O I94 n93 v l9l I88 56 LOWER TOUPPER i l ii 'I I97 [I H R B i H H l1 H H EM LM HG 3| UPPER +0 LOWER i \93 11 1W! mmlwx vm @Gi @iL' FIG. 33 FIG. 34

CLEAR KEYBOARD I88 II I FIG. 35A

ENTER & START INVENTOR. LLOYD J. LAPOINTE BY QM, MM! @ML ATTORNEYS April 30, 1963 L. J. LAPOINTE 3,087,573

DECIMAL POINT MECHANISM FOR CALCULATORS Original Filed Nov. 19, 1953 42 Sheets-Sheet 20 FIG. 36

p El D g 'F ll I56} I 254 251 252 I82 Q 55 INVENTOR.

LLOYD J. LAPOINTE ATTORNEYS 

1. A MECHANISM FOR DETERMINING THE POSITION OF A DECIMAL POINT IN A PRODUCT DURING A MULTIPLICATION OPERATION COMPRISING; A MOVABLE STORAGE BLOCK INCLUDING A PLURALITY OF SWITCHES FOR ACTUATION BY A DIGIT KEYBOARD, SAID STORAGE BLOCK ADAPTED TO SHIFT ONE SPACE TO DENOTE ONE DIGIT POSITION; MEANS, INCLUDING A DECIMAL POINT KEY AND A MULTIPLICATION KEY FOR ENTERING BOTH THE MULTIPLICAND AND THE MULTIPLIER INTO SAID STORAGE BLOCK; MEANS FOR MULTIPLYING THE MULTIPLICAND BY THE MULTIPLIER AND ENTERING THE PRODUCT IN AN ACCUMULATOR; COUNTING MEANS, INCLUDING SAID DECIMAL KEY AND A COUNTER WHEEL FOR COUNTING THE 